function [ status ] = mx_eyemsg_printf_ex( msec, msg )
%MX_EYEMSG_PRINTF_EX This allows us to send messages to the Eyelink tracker to 
% be logged into the data file with a time offset. Use it just like printf() to
% format the message text.
%
% Parameters:
% exectime 	time offset that reflects in the message's time stamp
% fmt 	printf format string
% Returns:
% 0 if OK, else error code.
%
%----------------------------------------------------------------------------
% Copyright Eduardo Aponte 2013
% aponteeduardo@gmail.com